Fixes for filters on p5.Graphics

[davepagurek]

Resolves #8790

Changes:

• Makes sure FilterRenderer2D uses premultiplied alpha, like WebGL renderers do
• Passes the renderer of the main canvas or graphic into the filter renderer to make sure the p5.Texture used in the filter runner is constructed correctly and updates correctly (it was never getting updated before on p5.Graphics)
• Fixes a bug where some visual tests were using 2x density if run on a 2x density screen instead of being locked into 1x for all visual tests

Sketch showing this working on a 2D canvas + graphics: https://editor.p5js.org/davepagurek/sketches/GES8eMEdg

PR Checklist

• npm run lint passes
• Inline reference is included / updated
• Unit tests are included / updated

[p5-bot]

Continuous Release

CDN link

• https://raw.esm.sh/pr/p5@396ab5a/lib/p5.min.js

Published Packages

• https://pkg.pr.new/p5@396ab5a

Commit hash: 76ba137

Previous deployments

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